I started counting drawers quarterly as a new auditor, ended counting them during the branch audits on a surprise visit. I let them count each other the rest of the year/time frame. I have found some odd things in drawers, from slush funds to personal funds that they didn't want their husband to know they had (yes, it was kept in their teller drawer) to bundles of new money with a ticker tape that was off quite a bit because they may have forgotten to reduce the total they had. In order to balance the general ledger I had to verify all cash within the branch to feel comfortable saying the branch did in fact balance. Although it may not be high on the risk profile, I did find ways to improve processes by doing the manual count...cost effective? - maybe in the long run. A count of a branch (7-10 drawers plus vault), though, usually only took an hour or two to finish.
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Do what you can, with what you have, where you are.
~Theodore Roosevelt~